Setting The Power-Save Mode - Z-World Fox LP3500 User Manual

Table 2 lists the power modes based on clock frequency that can be defined in software
using the
powerMode
The LP3500 can operate at various power levels, depending on the clock frequency and on
which subsystems on the board are turned off using the
lists the LP3500 subsystems that can be turned off with the
Table 3. LP3500 Subsystems That Can Be Turned Off
LP3500 Section
RS-232
RS-485
A/D Converter
(LP3500 model only)
LCD/Keypad Module
All of the Above
NOTE: RxE always remains active when the above systems are turned off to allow the
LP3500 to "listen" while it is in the
The LP3500 processor turns off automatically when VIN is removed, and the processor
will not operate again until VIN is restored. The onboard battery provides backup for the
SRAM and the real-time clock. VIN must be applied to the LP3500 in order to run or set
the processor in any of the numbered modes listed in Table 2.

3.2.1 Setting the Power-Save Mode

The LP3500 can be placed in the power-save mode using one of three different software
calls,
serCommAlert
timedAlert , or
digInAlert ,
depending on whether you wish to use Serial Port E, a simple timeout, or a digital input to
trigger the LP3500 to resume operation in one of the other power modes.
If you call
serCommAlert
of the low-power mode. If you call
power-save mode when the specified time has elapsed. If you call
LP3500 is triggered out of the power-save mode when the specified channel is activated.
In addition,
digInAlert
ated with them to wake up the LP3500 after a specified period even in the absence of the
digital or serial triggers.
20
function.
Receivers and transmitters are disabled, RxE remains active.
Transmitter is disabled.
ADS7870 internal oscillator is turned off.
LCD/keypad module is turned off.
All sections are disabled as described above.
,
, then any activity on Serial Port E will trigger the LP3500 out
timedAlert
and
serCommAlert
devPowerSet
devPowerSet
Description
power-save
mode.
, then the LP3500 is triggered out of the
have "backup" timeout parameters associ-
function. Table 3
function.
, then the
digInAlert
Fox (LP3500)